'Adding Machine 10Key iPhone' is a powerful calculator app that behaves like a true '10 Key' or 'printing calculator'. It offers the same functionality as popular calculators made by Monroe, Casio, Sharp, and others. The app features dual keypads with a total (*) key on either the left or right side, allowing users to choose their preferred layout.

One of the standout features of Adding Machine is its ability to review and edit numbers, add or delete lines, and save and retrieve paper tape files. Users can export their paper tape files to iBooks, Dropbox, email, or their favorite printing utility.

The app also offers a try-before-you-buy option with the Adding Machine Lite version available in the App Store.

Overall, Adding Machine 10Key iPhone provides a comprehensive and user-friendly calculator experience, making it a great choice for anyone in need of a reliable and efficient calculator app.